FBI Director Robert Mueller confirmed the timing of the purchase
today and said it was a Glock model 19 9mm semi-automatic
handgun.

The handgun purchase was legal, authorities said, and Loughner
was not a prohibited possessor.

Loughner emptied one magazine during the shootings that killed
six people and injured another 13, including U.S. Rep. Gabrielle
Giffords, his target, authorities said. A woman at the scene
prevented Loughner from loading a second magazine, said Pima County
Sheriff Clarence Dupnik.

More information

The pistol used in the shooting rampage in which six people were
killed and Rep. Gabrielle Giffords was wounded malfunctioned,
investigators said at a news conference today. Sheriff Clarence
Dupnik also said three people prevented the attack from being
worse.